The PDF format is used worldwide to distribute graphically processed documents. However, editing the documents is usually associated with high costs because good PDF editors are quite expensive. The cheaper alternatives, on the other hand, lack the important functions to make PDFs secure, for example by encrypting, digitally signing or adding watermarks. Secure-PDF puts an end to this: Encrypt your own or other people’s PDF documents with up to 256 bit key strength (AES). Add a password to open it so that users can only view the encrypted document by entering the correct password.
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